Canopy Growth — the world's largest marijuana company and the first to trade on the New York Stock Exchange — has been a wildly popular stock among millennial investors, and heading into the Canadian company's firs- quarter earnings report, that enthusiasm was only growing.

More than 26,000 investors on the stock-trading app Robinhood , which skews much younger than traditional brokerages, held the stock as of Tuesday afternoon. That's a 179% increase in holders since the stock first appeared on Robinhood's "Top 100" list in June. It's now the 42nd most-popular stock on the app.